linux-kernel - Re: [PATCH v12 00/22] mm/gup: prereqs to track dma-pinned pages: FOLL

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Date:   Thu, 9 Jan 2020 14:07:38 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Al Viro <viro@...iv.linux.org.uk>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, <bpf@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <kvm@...r.kernel.org>,
        <linux-block@...r.kernel.org>, <linux-doc@...r.kernel.org>,
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        <linuxppc-dev@...ts.ozlabs.org>, <netdev@...r.kernel.org>,
        <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v12 00/22] mm/gup: prereqs to track dma-pinned pages:
 FOLL_PIN

On 1/7/20 2:45 PM, John Hubbard wrote:
> Hi,
> 
> The "track FOLL_PIN pages" would have been the very next patch, but it is
> not included here because I'm still debugging a bug report from Leon.
> Let's get all of the prerequisite work (it's been reviewed) into the tree
> so that future reviews are easier. It's clear that any fixes that are
> required to the tracking patch, won't affect these patches here.
> 
> This implements an API naming change (put_user_page*() -->
> unpin_user_page*()), and also adds FOLL_PIN page support, up to
> *but not including* actually tracking FOLL_PIN pages. It extends
> the FOLL_PIN support to a few select subsystems. More subsystems will
> be added in follow up work.
> 

Hi Andrew and all,

To clarify: I'm hoping that this series can go into 5.6.

Meanwhile, I'm working on tracking down and solving the problem that Leon
reported, in the "track FOLL_PIN pages" patch, and that patch is not part of
this series.

thanks,
-- 
John Hubbard
NVIDIA